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FIGURE 1-12 Phase Diagram for Pure Inductance I LAGS VL Inductive Reactance. In a pure resistance the ratio of voltage to current gives the resistance R. In a pure inductance the ratio of voltage to current is: Chapter 1 Page 28 © G LONGHURST 1999 All Rights Reserved Worldwide Basic Radio Theory VL ------- = 2πFL I VL ------- is called the INDUCTIVE REACTANCE, XL, and is measured in ohms I Reactance/Frequency Graph. Figure 1-13 is the reactance – frequency graph for an inductor. X L = 2πFL XL α F Chapter 1 Page 29 © G LONGHURST 1999 All Rights Reserved Worldwide Basic Radio Theory FIGURE 1-13 Effect of Frequency on Inductive Reactance Pure Capacitive Circuit 39.
A phase diagram for the circuit is also shown in Figure 1-17. In this the potential difference (pd) across L is taken as greater than that across C and therefore the applied voltage leads the input current by the phase angle, φ . Impedance 42. Z = E --- is called the IMPEDANCE, Z of the circuit and is measured in ohms. I 2 R + ( X L ~X C ) 2 Resonance 43. , the input current is IN PHASE with the applied voltage. In this special condition, the circuit is said to be at RESONANCE. e. XL = XC Z is a minimum and is equal to R (from above equation).
83. Subject to the power transmitted, the higher the transmitter and/or the receiver the greater the direct wave range. 84. 25 ( H1 + H 2 ) where H1 is the height of the transmitter in feet, amsl H2 is the height of the receiver in feet, amsl 85. Chapter 1 Page 58 Obviously the presence of intervening high ground will invalidate the above formula. © G LONGHURST 1999 All Rights Reserved Worldwide Basic Radio Theory FIGURE 1-30 The Direct Wave The Surface Wave 86. Fortunately, the maximum range from a transmitter at which radio signals can be received is not always limited to the direct wave range.